Temperature dependence of palladium cluster formation in NaY and 5A zeolites
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Universitaet Muechen (Germany)
- Northwestern Univ., Evanston, IL (United States)
The CO-induced generation of palladium carbonyl clusters in NaY and 5A zeolites has been studied as a function of temperature by means of infrared spectroscopy. Pd/NaY, when calcined at 773 K and reduced in H[sub 2] at 473 K, contains Pd[degrees] atoms located in sodalite cages where they are inaccessible to CO at temperatures below 120 K. Small Pd clusters located in supercages are formed under CO pressures of 5 mbar in the temperature range 140-280 K. These clusters ultimately coalesce in 1 bar CO around 280-300 K and generate the Pd[sub 13](CO)[sub x] clusters, which are entrapped in the supercages. Small oligomers or clusters are formed on reduction in supercages of 5A zeolite. Exposure to CO (approximately 20 mbar) in the temperature range 260-320 K leads to the formation of Pd[sub 6] carbonyl clusters. 23 refs., 8 figs.
- OSTI ID:
- 6259182
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:14; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
ELEMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PALLADIUM COMPLEXES
PLATINUM METALS
REDUCTION
SILICATE MINERALS
SORPTION
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
ZEOLITES
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
ELEMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PALLADIUM COMPLEXES
PLATINUM METALS
REDUCTION
SILICATE MINERALS
SORPTION
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
ZEOLITES